CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Human embryo. Illustration of a human embryo aged 4 weeks (28 days) seen in the uterus. Measuring 4-5 millimetres in length from head to tail, the embryo does not yet appear human. Its head has developing eyes and pharyngeal arches in the neck; there are forelimb & hindlimb buds; and segmented somites along the spine. At this stage the heart has developed an early form of heartbeat; organs of the thyroid, lungs, liver, pancreas and kidney are forming. The embryo floats within its amniotic sac (brown), attached to the placenta (at lower left) by an umbilical cord. A yolk sac (yellow) supplies nutrients to the embryo.
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